>> pelley: the world's largest carmaker admits it rigged 500,000 vehicles to cheat on emissions tests. a criminal investigation may be next. also tonight, on the eve of the pope's visit, thousands vow to follow his example of compassion. >> i felt so good, i knew it had to be the right thing to do. >> pelley: man who figured to be a top candidate has dropped out of the republican race. and actress viola davis makes history. >> you're talented but you've been in the game for 20, 30, 40 years, and we want the same opportunities. >> this is the "cbs evening news" with scott pelley. >> pelley: tonight we have learned that the department of justice is opening a criminal investigation into a scheme by

the world's largest car companyq to rig its vehicles to cheat on u.s. emissions tests. volkswagen's c.e.o., who is an engineer, apologized today, but sorry didn't cut it with investors, v.w.'s stock dove off a cliff, down more than 17% in the u.s. the company saw more than $14 billion go up in smoke in one trading session, and it now faces billions in fines. kris van cleave is following this. >> reporter: the e.p.a. alleges the german automaker designed a so-called defeat device to allow cars to pass emissions tests they should have failed. certain diesel models were designed with sophisticated software that used information including the position of the steering wheel and speed of the vehicle to determine the car was undergoing emissions testing. the car was rigged to bypass that when being driven.

emissions increased 10 to 40 times above acceptable e.p.a. levels. professor dan carter was among the researchers at west virginia university that first reported the difference in emillses last year. >> once we started the test, it didn't take us long to realize emission levels for the two volkswagen vehicles were much higher than their certification levels. >> reporter: the carmaker ordered v.w. and audi dealers to immediately stop selling affected models of the beetle, golf, passat and a3. volkswagen admitted guilt and offered an apology. "i personally am deeply sorry we have broken the trust of the customers and the public. we will not and do not tolerate violations of any kind of our internal rules or the law." the e.p.a. says cars are safe to continue driving until v.w. fixes them. scott, tonight at least two members of congress are pledging to hold hearings on this issue. >> pelley: kris, thank you.

we have the list of v.w. and audi models involved on our web site, cbsnews.com. tomorrow pope francis begins his first visit to the united states. he'll arrive from cuba where he celebrated mass today for tens of thousands in holguin, the fourth largest city. among those at the mass was the cuban dictator rauúl castro. allen pizzey has found the communist regime is beginning to remove the chains from the church house door. >> reporter: massive settings like havana's our lady of mercy is a rare experience for most of cuba's catholic. the majority worship in makeshift churches like this one, no walls, no roof an altar brought in piecemeal, nonetheless, it's a far cry from the early days of the communist revolution in 1959 when people could be arrested for worshipping.

"i think now this fear is disappearing," he said. for the first time in 50 years, work has even started on a new catholic church. it will be named after pope john paul ii, whose visit here in 1998 helped thaw relations between the church and fidel castro. american priest father gilbert walker lives in cuba and says francis is seen as a symbol of hope. do you have any concerns that it's all going to like fine while the pope is here, and then the pope goes away and thing go back to something that you might not like? >> i don't think that there's going to be sort of a facade during the pope's visit. we'll see. >> reporter: the church has found a nearby -- niche serving the poor, using soup kitchens like this one to help those the government can no longer support. the state still won't let the church open schools but provided the building for this day care center run by sister teresa bernadette vaz. just a few years ago this would have been unthinkable, she said.

"what will happen in the future, we don't know." what cubans do know is the old days are slipping away, even if not at pages many would like. the hope is that francis will continue to press their government to change in ways that only he can. scott? >> pelley: allen pizzey traveling with the pope in cuba. allen, thank you. president obama will personally welcome the pope when he lands at joint base andrews outside washington at about 4:00 p.m. eastern time tomorrow. and cbs news will bring you live coverage right here. the pope will spend five days in washington, new york and philadelphia. homeland security correspondent jeff pegues is looking into the challenge of protecting a man who puts his own safety in the hands of the lord. >> reporter: the coast guard is out in force in philadelphia. they're patrolling the delaware river, ready to restrict boat traffic during the pope's visit.

captain benjamin cooper took us on patrol. >> we will have this area shut down. we'll have coast guard vessels here. we will screen vessels. we'll intercept them. we'll escort them through once we determine they are safe. >> reporter: from the water to the streets, construction has been under way for about eight months. it is so detailed that the secret service developed this 3-d virtual map of every location the pope will visit, and secret service agents have traveled to the vatican to study the pope's movements says david beach, the secret service agent in charge of all security in the city. what was the goal there? >> this pope likes to get out and mingle. the vatican folks wanted us to see that and see how they were and to make sure we would be able to accommodate that within reason. and, you know, i believe we can. >> reporter: officials tell cbs news there is no credible threat against the pope, but they remained concerned about so-called lone wolf attacks as the pope traveling through

philadelphia. he'll go straight by. he'll come around city hall and eventually end up back over here. >> reporter: mayor michael nutter says more than a million people may come to see the pope during his three outdoor events in the city. how do you sleep comfortablely knowing we've accountedded for everybody that's come in? >> good screen, good intelligence gathering and paying attention to what's going on. >> reporter: security will also be tight during the pope's three-day visit to washington. scott, he will deliver his first outdoor mass here at the national basilica on wednesday in front of an expected crowd of about 25,000 people. >> pelley: an exciting time. jeff pegues for us tonight. jeff, thanks. this evening wisconsin governor scott walker dropped out of then nomination. former texas governor rick perry left ten days ago. walker was a rising star, but he barely registered in the polls after weak performances in the first two debates. here was walker this evening.

>> i will suspend my campaign immediately. i encourage other republican presidential candidates to consider doing the same so that the voters can focus on a limited number of candidates who can offer a positive, conservative alternative to the current front-runner. >> pelley: after the second republican debate donald trump remains in front, but he's slipped eight points. carly fiorina has jumped into second plates, up 12 points. ben carson is down 5. here's major garrett. >> reporter: for the first time donald trump sounded hesitant about his path to the nomination. >> i don't think panic is a word that i use, but, you know, sure, i'd like the stay on top. i'm going to do what's right. if i don't make it, that's okay. i'll go back to having a good time and building a business. >> reporter: trump's caution is consistent with what he told us in early august. >> the only thing that can drive

me out if my numbers drop down. i'm a realist. >> reporter: retireder is john ben carson is embroiled in the kind of controversy usually reserved for trump for saying this about the possibility of a muslim president. >> i would not advocate that we put a muslim in charge of this nation. i absolutely would not agree with that. >> reporter: the u.s. constitution says no religious test shall ever be required as a qualification to any office. but car isn't's comments could appeal to part of the republican electorate, according to a gallup poll earlier this year, just 45% of republicans say they would support a muslim g.o.p. nominee. the topic arose after trump refused to correct a questioner last week when he falsely accused president obama, a christian, of being muslim and not an american. >> thank you. that's my pleasure. >> reporter: florida senator marco rubio, who jumped eight points in the cnn/orc poll, urged republicans to turn the page. >> he was born in the united

states. he's a christian. he's the president of the united states for next year and a half and we're going to move on. >> reporter: rubio's campaign picked up a top walker organizer in new hampshire even before the wisconsin governor dropped out. over the weekend close friends urged walker to ride out this tough spot, instead the governor stunned his most loyal financial backers and quit. >> pelley: major garrett in the washington newsroom this evening. major, thank you. on the democratic side, hillary clinton remains the front-runner, up five points in the past two weeks over bernie sanders and possible candidate joe biden. will vice president biden get in? here's nancy cordes. >> it's not like i can rush it. >> reporter: enter an interview with the catholic magazine "america," vice president biden said he's still deliberating and knows time is running out. >> we're just not, you know, it's not quite there yet, and it may not get there in time to make it feasible to be able to

run and succeed because there are certain windows that will close. >> reporter: but his increasingly antsy supporters in the draft biden camp suggest he's in. others say his wife jill might not be in, prompting others to say, of course dr. biden would be on board if her husband decides to run. >> i think everybody ought that give him space to decide what's best for his family. >> reporter: on "face the nation" on sunday, clinton said vice president does just like everyone else. >> this is such a personal decision, he has to figure it out. >> reporter: they'd be fighting over the same pool of voters. if biden does not jump in, nearly all his supporters would back clinton. >> at the end of the day, democrats like both of these people. >> reporter: democrats lover

both of these people. they agree on almost every issue. but what democrats want more than anything is to protect the gains we've made, whether it's affordable care, whether it's economic progress and other things that the obama administration has done. > reporter: so clinton is spending the next two days campaigning not to protect obama care but to expand it with new caps on drug bills. as for biden, scott, one party insider told me the only true deadline is the primary filing deadline in early states, and that's not until late november. >> pelley: nancy cordes, thank you very much, nancy. today we saw more evidence of russia's military buildup in support of assad's dictatorship in syria. satellite photos show russian fighter jets in eastern syria and david martin reports the russians have deployed dozens of jets and helicopters. there is concern that they may target rebels that the u.s. supports on come in conflict with american planes that are bombing syria. the exodus from syria's civil

war is behind the refugee crisis in europe, and today hungary posted ads in middle eastern newspapers warning refugees that they face prison if they enter illegally. mark phillips reports more borders were shut today. >> i want to get to austria. >> reporter: this is what happens if you're late to the refugee bus. >> am i a human or not? now! answer me now! >> reporter: the stragglers tried to get to western europe through slovenia have discovered it's closed. slovenia only agreed reluctantly, ad many harrowing scenes, to allow the thousands who had crushed up against its borders to pass through. and then only on the condition that they move straight on to austria, germany and points north. now police have sealed off the frontier again and the migrant

border camp is being dismantled. another day, another fence, this one being put up by slovenia, closing a route the refugees have been using the past few days. the message, we're full, enough's enough, don't come. the refugees agree they don't want to be here either. some were so desperate to get on to a train leaving cray shark they didn't wait for an invitation, breaking through police lines and scrambling through windows. fights broke out. >> no fights! >> reporter: those who have been dealing with the crisis on the ground, like francesco rocca of the red cross, aren't holding out much hope for a quick solution. >> this is something that must be solved. this week we'll gain another meeting. we're waiting. every week there is a high-level meeting. there is no response from that meeting. nothing happens. >> reporter: nothing happens because the arithmetic doesn't add up. if you take the numbers of all the migrants that various

european countries have agreed to accept, that's that still doesn't account for the hundreds of thousands who are already in europe. and, scott, more are coming. >> pelley: mark phillips with the refugees tonight in croatia. history is made at the emmy awards, but why did it take so long? and the pope inspired her to give a neighbor a tremendous gift when the "cbs evening news" continues. keep returning. my constipation feels like a pile of bricks... that keeps coming back. linzess can help. once-daily linzess treats adults with ibs with constipation or chronic constipation. linzess is thought to help calm pain-sensing nerves and accelerate bowel movements. linzess helps you proactively manage your symptoms. do not give linzess to children under 6

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line. >> reporter: using the words of harriet tubman, viola davis crossed a very big line in hollywood and made history. >> the only thing that separates women of color from anyone else is opportunity. >> reporter: this was a moment 67 years in the making. >> 67. >> reporter: what did you want people to take away from your speech? >> women of color actress, we sit around and talk about it all the time. we want to get past that line. we want people to know we've been in the game for 20, 30, 40 years, and we want the same opportunities. it's not like there's been a plethora of leading actress roles and you just haven't recognized our talent. there has been nothing. >> reporter: just 13% of female characters on television are african american. 78% are white. >> how to get away with murder. >> reporter: davis won the emmy for her role as analise keating on the show "how to get away with murder." in one memorable scene last season, she removed her wig and

stripped off her make-up. why is this woman so important? >> i know women like analise who don't fit the mold but have a very colorful sex life, but i have not seen that on the screen. >> reporter: yet she thinks this could be a breakthrough year. >> you let me be me. >> reporter: fellow black actresses, uzo aduba and regina king also took home emmys. >> it's passing the baton that gets you to that finish line, but it's just your leg of the race. it's not the whole race. >> reporter: and viola davis is rooting for those who are still running. ben tray, cbs news, los angeles. >> pelley: one of the most familiar faces on television the past 60 years has died. his story is next.

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prison for a salmonella outbreak. nine people died in 2008 and 2009 and hundreds more got sick. a federal jury convicted stuart parnell of knowingly shipping contaminated peanut butter and faking the lab results. one of the stars of television's golden age has died. jack larson, known to generations of american kids as jimmy olsen. >> up in the sky, it's a bird... >>it's a plane... >> it's superman. >> pelley: olsen was a young journalist for "the daily planet" in the 1950s "superman" series. >> have you got any ideas, chief? >> you're supposed to be a reporter. you get the ideas, and don't call me chief. >> pelley: olsen's main role was to provide someone for superman to rescue or serve as a comic foil. >> i've got it this time, chief. >> what is it this time?

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>> reporter: christine heidt is so moved by pope francis she's honoring his arrival with a pledge to donate a kidney. was it an emotional moment for you when you decided to do this? >> it was amazing. i felt so good. i knew it had to be the right thing to do. >> reporter: do you see this as a lesson for your children? >> oh, absolutely, because there's a million reasons not to do it, and the one reason to do it is to help someone else. >> reporter: the walk with francis pledge campaign was the idea of father jonhn enzler, president of catholic charities. >> it can be major sacrifice, but it doesn't have to be. >> exactly, for some people it might be, i'm just going to help out by raking the leaves for my neighbor twice during the fall. i call this a toe in the water idea. put your toe in the water of service. you might get up to your knees pretty quickly. >> reporter: at st. matthias school in maryland, the students

decided to launch a food drive. 11-year-old jaylene sotelo and nine-year-old ignacio joy say they were inspired by francis. >> because of all the good deeds he's done. >> reporter: why do you like pope francis? >> because he loves the poor. >> reporter: father enzler's goal is 100,000 pledges by the time the pope arrives, and he just might make it. as for christine heidt, her plan was to give her kidney to anyone who needed it, but it turns out through what she calls divine intervention she's match with someone in her own parish who desperately needs a kidney. >> there are times in life when you give and there are times when you receive, and those times that you risk the greatest are when your life will change the most. >> reporter: there is no greater gift to one's self, she says, than giving hope to someone else. chip reid, cbs news, cumming, georgia. >> pelley: and that's the evening news. for all of us at cbs news all ar

right now at 7:00, metro trains are running at full service after yet another smoke incident this morning. thank you for joining us. i'm lesli foster. >> i'm jan jeffcoat. a transformer fire near the stadium armory station caused big backups on the orange, silver, and blue lines. russ ptacek talked with frustrated commuters and tracked down how metro reacted today. >> this is one of the first trains we've seen since metro restored service at about 5:00 this evening. out since early this morning creating metro chaos during the rush hour, passengers complaining about poor community. >> they say shuttle buses are waiting for us and we don't know where to go. >> more trains are passing now, the fire department